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I'm at work and can't view the video right now. 70Ah cells should take 3C all day, and 450A no problem for as long as you'll need to accelerate up to your target speed. I would suggest pricing out the new CALB CA series cells (grey cells) vs CALB's older SE (blue cells) and other makers. They seem to have a significant boost in cold weather performance as well as cycle life. Worth the small price premium. I think they're going for around $1.28/Ah right now.
Normally, I think that Wh/mile is calculated from the wall, not while driving. I know my friend with a Leaf is getting around 200Wh/mile from the wall in summer. I think that is a pretty darn good number. If you had a efficient charger you shouldn't be far off from that.
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